xyarray__new
evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
evsel->mmap = xyarray__new(ncpus, nthreads, sizeof(struct perf_mmap));
struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size);
values = xyarray__new(ncpus, nthreads, sizeof(struct perf_counts_values));
values = xyarray__new(ncpus, nthreads, sizeof(bool));
evsel->start_times = xyarray__new(perf_cpu_map__nr(cpus),